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Thread: 2v tune-up

  1. #1
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    Default 2v tune-up

    Folks - I'm hoping for some advice - I'm about to spice up my 900SS-engined Bimota DB2. Although there's nothing particularly wrong with it at the moment - it could do with a bit more.

    The plan at the moment, over the currently stock configuration:
    * Open breathing bimota exhaust
    * ST2 cams
    * 94mm barrels, with ST2 pistons
    * replacing (old, silver) head studs
    * lightweight flywheel

    It'll need some dyno time, and either an updated fuel chip or a PC to get the fueling right once that is in place. I use it on the road only. I was considering high-compression pistons, head porting and adjustable cam pulleys, but I guess I've got to start drawing the line somewhere.

    Does anyone think that there is anything that I'd be daft to overlook at this point, or otherwise need to reconsider?

    As always - Brads site has made useful research:
    http://www.bikeboy.org/900carbv2cam.html
    http://www.bikeboy.org/900sscarb944.html
    http://www.bikeboy.org/900equal.html
    http://www.bikeboy.org/camtime2v.html

    Thanks,
    Mike

  2. #2
    Join Date
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    Default

    what ecu is in it?
    Brad The Bike Boy

    www.bikeboy.org

  3. #3
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    Default

    I thought DB2's were carburated. ??

  4. #4
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    Default

    Quote Originally Posted by brad black View Post
    what ecu is in it?
    TDD MINJ01

    As best as I've figured out so far, that ECU is only used in a small number of Bimotas (the 147 DB2SR's that were produced, SB8R's and V-Due's) and Italian Group-N rally cars. Although it uses the same type of EPROM as the Marelli ECUs of that vintage, the on-chip layout isn't the same, and I was not able to locate the fuel/ignition curves... but that's ok.. because I've tracked down the fella in Germany that last tuned this machine 22 years ago, and he's going to cut me a new chip once I have it Dyno'd.

    It's now up and running on 944cc with ST2 cams (thanks Brad, your pages were interesting and valuable), and Dyno time booked for tomorrow. Of the list of stuff I was considering below, I couldn't do the flywheel - once I'd taken a closer look, I found that it already has a custom flywheel on it from Bimota, with holes drilled in a 60-2 phonic wheel pattern for the EFI (but still using the standard pickups). It wouldn't run with a lightweight 900ss flywheel.

    Separately, I've been toying with creating an interface board to allow a speeduino based ECU interface with the existing loom, and I think it's easily possible, but probably a future project (and is certainly a contingency if this ECU ever dies irreparably).

    Mike
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    Last edited by hindsight; 03-06-2020 at 02:57 AM.

  5. #5
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    Default

    Quote Originally Posted by marvin View Post
    I thought DB2's were carburated. ??

    Most were, but 147 DB2SR's were produced with EFI

    https://www.carolenash.com/insidebik...bimota-db2-sr/

  6. #6
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    Default

    can you email me the eprom file?
    Brad The Bike Boy

    www.bikeboy.org

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